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This dissertation for the degree of doctor of medicine at the University of Copenhagen describes in detail the author's observation on specific agglutination in typhoid paratyphoid fevers, with special reference to H and O agglutinins. It will be recalled that H, or flagellar, agglutinin reacts with motile bacilli and gives rise to a floccular, large flake agglutinate, while the O, or somatic, agglutinin reacts with nonmotile forms and gives rise to a granular, small flake agglutinate. To secure the most reliable results, tests should be made for both H and O agglutinins. The dissertation, which is in Danish with an English summary, will be of value to workers with typhoid and paratyphoid agglutinations.
Nogle Undersøgelser over Widalreaktionen ved Tyfus og Paratyfus. Af. JAMA. 1937;109(10):818. doi:10.1001/jama.1937.02780360066037